Looper mechanism for sewing-machines.



L. ONDERDONK. Loom: MECHANISM FOR SEWING MACHINES.

APPLICATION FILED AUGAG 1910.

Patented JuIL'H, 1916.

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L. ONDERDUNK.

LOOPER MECHANISM FOR SEWING MACHINES. APPLICATION FILED AUG.6. 1910.

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LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOOPER MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Jan. 11, 1916.

Application filed August 6, 1910. Serial No. 575,943.

To all whom it may concern Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at New York city, in the county of New York, State of New York, have invented certain new and useful Improvements in Looper Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing, and to the letters and figures of reference marked thereon.

The invention relates to new and useful improvements/sin sewing machines, and more especially to single chain stitch sewing machines.

An object of the invention is to provide a loop-operating mechanism wherein the looper is moving substantially bodily when the beak of the looper is entering the needle loop, and wherein the looper is then oscillated in order to quickly carry the same into the needle loop.

A further object of the invention is to provide a looper-operating mechanism wherein the looper is moved bodily while the needle loop is thereon for positioning the needle loop to receive the needle, after which said looper is oscillated in order to quickly retract the looper from the needle loop.

"" l hesefiandmther je will in part be obvious, and will in part be hereinafter more fully described.

In the drawings which show by way of illustration. one embodiment of the invention, Figure 1 is a front view of part of a sewing machine having my invention embodied therein; Fig. 2 is an end view of the same; Fig. 3 is a detail view showing the position of the parts when the looper beak is entering the needle loop; Fig. 4 is a similar detail view, showing the position of the looper at the forward end of its stroke; Fig. 5 is a detail view showing the position of the looper when the needle is about to enter the needle loop carried by the looper; and Fig. 6 is'a view showing the looper at the rear end of its stroke.

Fig. 7 is a detail showing a section of the' main shaft and an eccentric foroperating My improved looper mechanism may be applied to any desired type of sewing machine. As herein shown, I have provided a bed plate 1, which supports the usual overhanging arm, in which a needle 2 is reciprocated. A feed dog 3 which may be of any desired type, is used for feeding the material to the stitching mechanism. Said feed dog 3 is preferably cut away on the under side, in order to form a clearance for the looper.

The looper 4 is of the usual construction, and consists of a beak 5, which is located at the end of a uniformly tapered body portion. The shank of the looper is mounted in a looper carrier 6, which carrier is clamped to a looper-supporting shaft 7.

The looper-supporting shaft 7 is mounted to oscillate freely in spaced arms 8 and 9, which in turn are rigidly fixed on a supporting shaft 10. The shaft 10 for supporting the arms 8 and 9 is journaled in bearingsll and 12, which are secured to the bed plate of the machine by suitable screws 13.

The shaft 10 carries an arm 14 which is rigidly fixed thereon, and at its free end is pivotally .connected to an eccentric strap 15,. cooperating with an eccentric 16 on the main shaft 17. It will readily be seen that as the main shaft rotates, the eccentric will oscillate the shaft 10, which will in turn oscillate the arms 8 and 9, bodily carrying the looper-supporting shaft 7 back and forth. On the end of the looper-supporting shaft 7 is a crank arm 18, which is rigidly secured thereto by the screws 19. On the end of the main shaft 17 is a crank arm 20, which is adjustably secured thereto by a screw 21. A link 22 is pivotally connected at one end to the crank arm 20 on the main shaft, and at its other end to the crank arm 18 on the looper-supporting shaft 7. As the main shaft rotates, the crank on the end thereof will, through thelink 22, impart an oscillation to the looper-supporting shaft 7.

It will readily be seen that in the rotation of the main shaft, the looper-supporting-shaft 7 will be not only oscillated from and oscillating movements imparted to the looper-supporting shaft, may be varied. The parts are preferably timed, however, so that when the looper is at the rear end of its stroke, the parts are substantially in the position shown in Fig. 2, that is, with the crank arm on the end of the main shaft at its full rearward throw, and the eccentric on the main shaft moved through a portion of its forward throw, so that the full forward throw of the eccentric will be reached before the crank arm reaches its full forward throw.

Starting with the looper at the rear end of its stroke, it will readily be seen that said looper is positioned with the beak thereof well upclose to the feed dog, and as the crank arm moves to oscillate the looper, the eccentric carries the looper supporting shaft bodily forward, with the result that the looper moves bodily forward to the position as above noted. This bodily movement of the looper continues until the beak of the looper has entered well into the needle loop. By this bodily movement of the looper into the needle loop, I am able to cause the beak of the loope to cross the needle well up toward the work support, so that it will enter with certainty into the needle loop without skipping stitches. As soon as the beak of the looper has taken the needle loop, it is desirable to move the looper quickly to the forward endof its strok I accomson of the fact that the bodily. forward movement of the looper-supporting shaft has been reached when the beak of the looper has entered part way into the needle loop, and as the crank arm still continues its forward movement, the looper will be oscillated on its looper supporting shaft. During this oscillation, the supporting shaft itself begins its backward travel, which will cause a very quick forward movement of the looper to its extreme position in the needle loop. The crank arm now begins its rearward travel and tends to oscillate the loo er so as to retract it from the needle loop, but

inasmuch as the looper-supporting shaft is also still traveling in a rearward direction, or toward the front of the machine, the looper will be moved bodily backward, carwas rying with it the needle loop and positioning the same across the fieedie throa t, so that the needle will enter with certainty into said needle loop.

As soon as the point of the needle is well into the needle loop, it is desirable to re tract the looper quickly from the needle loop. This is accomplished by reason of the fact that the rearward bodily travel of the looper-supporting shaft is finished, and the crank arm still moving in a rearward direc tion will oscillate the looper. The looper-'.

supporting shaft beginning its forward looper to the forward end of its stroke.

'plishednot only by an oscillation of the looper but the carrying forward of the looper-supporting shaft, which will cause the beak of the looper to move upward slightly as it is retracted from the needle loop, thus releasing the needle loop from all strain which is liable to break the thread.

It will. readily be seen, therefore, that I have provided a looper mechanism wherein the ordinary looper without any retaining shoulder or retaining spring, may be used, which looper is quickly moved into the needle loop, taking the needle loop well up on the needle and which looper is quickly nnwed out of the needle loop, lifting the 5 beak'as it-is .retracted, so as to avoid any strain Whatever on the fidleloopT --y- -nh.

.plish this quick forward movenieitbfreaQg from the spirit of my invention.

Tlwlooperjs moved bodily by the eccentrio 16, which is provided with an arcshaped slot to receive the main shaft 17. The eccentric .16 is secured to a disk .25, which is pivoted at 26 to a second disk 27, carii'dbyacollaF28fiYedpIrthe main shaft 10 17 A slot and screw connection 29 between the disks 25 and 27 allows for an adjustment of the disk 25 relative to the disk 27. This adjustment of the disk 25 will shift the eccentric so as to vary its throw. The slot in the eccentric allows the adjustment to be made.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is 5 1. In a sewing machine, the combination of a work support, a needle, a looper located and operated entirely beneath the work support, means for supporting said looper, and

means for moving the looper into and out of the needle loop, including devices for bodily moving the looper support so as to carry the looper into the needle loop, and devices for oscillating the looper support, to moveithe 2. In a sewing machine, the combination of a needle, a looper located and operated entirely beneath the work support, means for moving said looper bodily forward unt1l the beak thereof has entered the needle 13c for bodily moving said looper in a rearward direction While in the needle loop for positioning the needle loop for the entrance of the needle, and means for oscillating said looper to retract it from the needle loop.

4. In a sewing machine, the combination of a needle, a looper located and operated entirely beneath the work support, means for moving said looper forwardly into the needle loop and for retracting the same from the needle loop, and means for lifting the beak of the looper as it is retracted from the needle loop. I

5. In a sewing machine, the combination of a work support, a needle, a looper movable into and out of the needle loop beneath the work support, a looper supporting shaft on which the looper is mounted, said shaft being so disposed as to cut a vertical plane containing the line of feed, means for oscillatin the shaft, and means for bodily moving t e shaft in a direction at right angles to its longitudinal axis.

6. In a sewing machine, the combination of a work support, a needle, a looper moving into and out of the needle loop beneath the work support, a looper supportin shaft on which the looper is mounted, sai shaft being so disposed as to cut a vertical plane containing the line of feed, means for oscillating the shaft, and means for bodily movingthe shaft in a direction at right angles to its longitudinal axis, said means for bodily moving the looper being so timed to Hoperate in advance of the means for oscillating the looper.

7. In a sewing machine, the combination of a work support, a needle, a looper locatedand operated entirely beneath the work support, a looper supporting shaft on which said looper is rigidly mounted, spaced arms in which said looper supporting shaft is journaled, a main shaft, an eccentric'on said main shaft, means cooperating with said eccentric for oscillating said arms, a crank arm carried by the end of said looper supporting shaft, a crank on the main shaft and a link connecting said crank arms. .8. A sewing machine including in combination a work support, a needle, a looper located and operated entirely beneath the work support, and adapted to move into and out of the needle loop, a looper supporting frame, means for oscillating said frame about a horizontal axis, a shaft, loose in said frame, on which said looper is mounted, and means for oscillating said shaft, said means for oscillating the shaft being timed relative to the means for oscillating the frame, whereby said looper is moved bodily forward until the beak thereof enters the needle loop, and whereby said looper is subsequently oscillated to carry the looper to the forward end of its stroke.

In testimony whereof I affix my signature, in presence of two Witnesses.

LANSING ONDERDONK.

Witnesses:

J H. 'HoWELL, WM. BLANCHARD. 

